Name: SO-100 (SO-ARM100)
Brand: TheRobotStudio × Hugging Face (open source)

TheRobotStudio × Hugging Face (open source) SO-100 (SO-ARM100) (1)

~$232 DIY parts (pair)Original BOM total for a leader + follower pair; superseded by the SO-101 in 2025.

Discontinued · used/leftover onlyPython from a laptopLeRobotSuperseded by SO-1013D printed

Possibly ≤ 1 weekShipping: Build or leftover kits. New builds should use the SO-101 files; some vendors and second-hand sellers still offer SO-100 kits and parts.

Remote control: Same as the SO-101: USB to a laptop and driven by the lerobot Python library.

SO-100 docs (deprecated) ↗GitHub ↗

Overview

The arm that made LeRobot take off in late 2024, a low-cost, 3D-printed 6-DOF leader/follower pair designed by TheRobotStudio with Hugging Face. Its documentation is now marked deprecated in favor of the SO-101, which fixes wiring and assembly pain points; existing SO-100 arms keep working with the same software.

Specifications

Category	Robot arms · Desktop & hobby arms
Released	2024
Availability	Discontinued · used/leftover only
Programmability	Open source (hardware + software)
Best for	Ages 14+ (estimated)
Vision sensors	No vision sensors
Actuators	Smart servos (Dynamixel, Feetech…)
Audio	No audio
Compute type	Laptop / PC as the brain
Remote control	Python from a laptop
DOF	6 (5 joints + gripper)
Reach	Not published
Payload	Not published
Repeatability	Not published
Weight	Not published
Controller	None on the arm; serial bus-servo driver board to a host PC over USB
Sensors	Servo position feedback (Feetech STS3215); user-added cameras
SDK	Hugging Face `lerobot` (Python); code and parameters are compatible with SO-101